comparative and superlative of compound adjectives

I, I don t know how I can make the comparative or superlative of compound adjectives.

I d like to know the grammar rules. I didn t find it on the internet or in the grammar books.

For exemple:

good-looking, old-fashioned, open-minded, deeply-rooted, densely-populated, well-behaved, never-ending, record-breaking, free-standing andso on.

Thank you.